Do you have a large male client-base?
Men are fantastic clients for additional services, so why not offer them something really different when they visit your salon?
If you have a car wash nearby and people are able to park near your salon, why not strike up a deal where the client can get their car washed at the same time they are having their haircut? It’s the full service package of both them and their vehicle. Whilst their car is washed, polished and hovered, they have their hair cut and styled. You could even throw in a wet shave.
If you can get the car wash to pick up their car from your salon and return it when the client is finished then even better! Even if you don’t have a car wash nearby, you could get a small team together who can do it in your salon’s car park on certain days of the week.
The idea may not be feasible for every type of salon, but if you can do it, then give it a shot. You have nothing to lose.